Skip-stop control mechanism



June 16, 1936. A JOHNSON 2,044,076

SKIP-STOP CONTROL MECHANISM Filed Aug. 9, 1934 was J 7; 4 Ell mNTOR Z Z/ber/{W 272/1605 I I Patented June 16, 1936 2,044,076" SKIP-STOP CONTROL MECHANISM Albert M. Johnson,

Barnes Drill Company,

Application ,Au

poration of Illinois Rockford, 111., assignor to Rockford, 111., a corgust 9, 193.4, Serial ,No.. 394% 17 Claims. (01. 74-2-7) The present invention relatesvto, improvements in control means adapted for defining the limits of the reciprocatory movementsv of an, operating device, wherein it is desirable that the control be adjustable with ease and precision,

and has particular reference to an adjustable control device including a stop bar having adjustable stop members thereon for defining the limits of movement of an operating member longitudinally of the bar.

A common form of control mechanism found the combination of principal stops and skip-stop means which desirable for this purpose includes will determine not only the utmost limits of reciprocation of the operating member but will also,

where desired, confine the within more restricted limits.

reciprocations thereof The various stops of the control must be accurately positioned to secure best results.

Moreover, it is often desirable to make slight or radical adjustments before or after the machine is in the stroke of the reciproca complishment of which it operation so as to vary ting parts, to the achas heretofore been necessary to halt the machine and adjust the stops by means of set screws or-similar relatively cumbersome expedients.

The primary object of the present invention,

therefore, resides in the p justment means carrying stops rovision of novel adfor controls which embody a bar for limiting the reciprocatory movement of an operating member, and in which the relative position of the stops may be easily and accurately adjusted without interfering with the normal operation Another object is to of the associated machine. provide an improved skipstop' control device of the foregoing character which can be adjusted by a screw action to regulate with precision the length of the reciproca tions of the operating member and which will remain in proper adjustment in spite of repeated concussions incident to contact of the operating member with the stops.

Another object resides in the provision of an improved control mechanism of the foregoing character including an of the stop on the bar may r adjustable stop having a screw threaded part cooperative with complementary means on the stop bar whereby adjustment be efiected by simple manipulation without the use of tools.

Another object of the invention is to provide improved control means of the foregoing character in which the stop members are freely adjustable on the stop bar, and

in which means are provided for substantially locking the stop members against disturbance o f the precise relative machine partand micrometer adjustment of the member. lo

Other objects and advantages will become apparent in the following description and from the accompanying drawing, in. which:

Figure 1 is a fragme tary elevational view partly in section of one form of the inven n. 5 F 2. isasectional planviewtalsen online -4 of Fig: 1.

Eig. 3 isaafragmentary elevational view partlyin section oi a-difierent form oi the inventiomv Fig; 4 iso sectional .planview taken on lines 4W4 of Fi 3.

Fig; 5 is, a fragmentary sectional elevation showing one of the stops oi the formci theinv ntion shown in Fig. 3 in unlocked position-V to permit substantial vertical movement of thestop mem: ber.

While the. invention is susceptible. of various modifications and alternative constructions, I hav shown in'the drawing and will herein describe in detail the preferred embodiments, but it is who understood thatI. do not hereby intend to limit the invention to the specific forms disclosed, but intend to cover all modifications and alternative constructions falling. within the spirit and scope of the inventionas-expressed in, the appended claims.-

The improved adjustable control means of the: present invention may be used in various machines, butit has been found of particular merit for use in connection with honing machines such. 4 for example, as described in Patent No. 1,783,019, issued to me on November 24 1930, wherein a reciprocating head supports spindles carrying hones for operating upon internal cylindrical bearing surfaces. In such a machine the reciprocatory movements of the head must be accurately controlled so that the length of stroke of the hone will be within proper limits for the surface being honed.

The means for controlling reciprocation may comprise a stop bar mounted with its axis parallel to the reciprocatory movements of the moving having spaced stops adapted to be engaged by a stroke arm such as a. lug orother projecting element associated with the said reciprocatory part of the machine. The stops are prefplitude defined by the space between the skiperably adjustable to vary the amplitude of recipstop and one of the principal stops. rocation of the said stroke arm as desired, and a The skip-stop 28 comprises as one element an salient feature of the present invention resides adjustment member which may be in the form 5 in the provision of manually operated screw of a disk encircling bar Ill and of a diameter 5 threaded adjusting means for accomplishing this substantially less than that of the stops I and result. E5 so that lug 23 may pass freely thereby. The

Referring more specifically to the drawing, a disk 3E) is internally screw thread d t engage stop bar 50 of substantial length is suitably supwith threads i? on the bar and has a compression ported by means, not shown, adjacent a relock comprisingaradial aperture 3! within which 10 ciprocable part of a machine and may be of hexis received a ball 32 resiliently urged into engage agonal or any other similar geometric cross secment with one of the faces I2 of the bar #9 by tion to provide a plurality of relatively fiat faces means f Sp ng 33 Which s d n place by e [2 about its periphery (Figs. 1 and 2). Principal c ew p u Adjustment of the member 33 on stop members l4 and I5, which may be in the the bar It) is effected by screwi g the same one 15- form of disks of substantial diameter and which Way or the other on the bar. are provided with internal screw threads l6, fit he p pa p n of the pp y about the bar l0 and engage complementary comprise a block 35 non-rotatably mounted on means thereon which may take the form of the bar no but freely slidable longitudinally therethreaded sections ll tapped in the areas of preof. The block 35 is connected with the disk 38 2o dominating radius on the periphery of the bar. in a manner to permit free rotation of the disk A stroke arm l8 associated with the reciprocable to eflect adjustment of the skip-stop 011 th bar part of the machine is positioned for longitudinal T us, a collar 36 is formed on disk 33 and has movement between the stops M and I5 and is an annular recess 37 in which a segmental rim adapted to engage with a face E9 on each stop, 33 formed on an upward extension 39 on one face 2.5

The arm l8 will strike the stops with some force of the block 35 is slidably received. and each of the stops l4 and I5 is therefore proh Contact face f the k pp for n a evided with an integral collar section 20 which is ment w the lug ay e f m d as an inalso internally screw threaded and engages with egral part Of block t a desirable a n the threads IT on the bar. This increases the e t s secured through the provision of a lever 30 area of engagement between the bar and the stop 2 mp s a bifurcated y embracing h members whereby the stability and rigidity of the block and pivotally mounted thereon. The free stops is assured even under the repeated ooncusends of the bifurcated arms of the lever 42 are sions of the arm :8 therewith, secured on a pivot pin 43 extending through 35 The force of the concussions incident to operathe block, and the crotch of the lever extends 35 tion of member l8 may tend gradually to force under the lower end of the block for pivotal the stops out of adjusted position and to prevent movement into and out Of engagement therewith. this accidental movement of the stops, resilient A lateral 45 formed n one Or both of the locking mean i as o iated th r ith, A simple arms of lever 42 and has a recess 65 in one face. form of locking means is shown by way of eX- A ell compression spring 4? Seated at one end 4o ample, and consists of aradial aperture 22 formed in the recess a abutting a s t e end in each stop and adapted to receive a ball 23. age-inst a fi 1 9 O the b ock 35, tends to A s ring 24 engages the b ll t urge th same hold the crotch of the lever against the lower into contact with one of the engagement faces end Of the block. Suitably secured in the crotch 45 12 of the bar l9, and a screw plug 25 is received f the lever 42 or formed as a pa t there a d 45 in an outer threaded portion 26 of the aperture extending Outweldly therefrom is a pawl 5 av- 2: t be r against the oute nd of th spring ing a horizontal contact surface 51 and an inand place the same under tension. When the 01111801 e d nta Surface 52- disks :4 or l5 are rotated, the ball 23 will be such m m M a d I5 are adapt d t define cessively and resiliently wedged against each face the uppermost and lowermost limits of mc m .30 I 2' of the bar l0 and will tend to maintain the 0f the Stroke arm and the Skip-Stop D stop against accidental movement until the same Vides a Control for the pp st l m t of m0veis positively manually urged into anoth r posimerit of the stroke arm during certain periods tion. The minuteness of adjustment possible with the Operations of e e ecc ated machine. 55 this form of control device, therefore, is propors, W n the arm s carried d w wa dly t 553 tionate to the pitch of the threads l6 and I1 and Will engage st t e incl ned face 52 on the the number of engagement faces [2 with whi h pawl 58, which will cause the spring means 4? to the locking ball 22 may successively engage compress and allow the lever arms 42 to move in Where t movement's of the recjprocatory clockwise direction as viewed in Fig. l to permit member of the machine in conjunction "with the arm to Pass beyond the Pawl- Thereupon, the 6 which control means is used must be varied spring means 4'! will urge the crotch of the lever for diflerent periods of operation, it is desirable 42 back mm engagsmem with the block 4! and to rovide Ski 6 ns int face 5i of the pawl will be interposed in the path p p p m erme late the prm of the arm I8 so that further upward movement cipal stops whereby periodically to confine re- M ciprocations of the stroke arm to a stroke of deg 95 3 f g ag a; iz fined amplitude less than the full stroke bet e p w r -ummg 8 ar about Its t axis when it is desired to move the pawl 59 out o l principal an example of F the path of arm l8 to allow the latter to travel to Pedlent accomphshmg this result Wlth the the utmost limit defined by face IQ of stop it. control means of the present invention, there is The above described control means is advanshown as mounted on the bar l6 inte tageous where accurate adjustment of the ret p 'l lpa DS l4 and a skip-Stop mem spective stops is desired for operation upon work 23 WhlCh 15 ad p d to o fi e the reeiprocetory of standard character and where once an adstrokes of arm l8, and thereby of the reciprocatjvsted relationship has been secured no radical mg machinery associated therewith, to an amchanges will ordinarily be necessary for a substantial time. However, in some machines it may become desirablenot only. to efiecta mi-, crometer adjustment of the stops but also to provide for quickly and substantially varying the relative positions of the stops in order to accommodate varying operative requirements. As an example, reference may be had to cylinder'honingmachinesin which it is necessary to-adjust the control to vary the stroke of the bones to operate upon cylinders of difierent lengths.

The form of the invention exemplified in Fig. 3 has been found. desirable in meeting the last mentioned requirements, and provides a control embodying yieldable means serving'toprevent accidental movement of the stops after the desired micrometer adjustment has been effected, but permits quick shifting of the stops longitudinally of the bar when a revised relationship of the stops is necessary. As an essential part of the modified control there is provided a stop bar 55 which may be round or of any other desired geometric cross section and is adapted to be suitably supported on a machine to be controlled. Uponthe bar are slidably mounted principal stops 56 and 51 of preferably similar construction and having associated rotatably mounted worm wheel adjusting members 58, preferably disposed with their axes parallel to bar 55. The threads of worms B are adapted to engage with complementary means on the bar 55, such as a rack Bil milled longitudinally thereof.

In the following description the construction of the lower stop 51 will be particularly referred to but due to the similarity of. detail of the upper stop 55, the description is equally applicable thereto. The worm 58 is rotatable on a pintle 52 secured to or forming a part of a lever 63 which is pivotally mounted in a radial slot- 64 formed in the stop member. A pin 65 extends through a collar 66 on the stop and through lever 63 and serves as the pivot therefor. A collar 61 is suitably secured to the outer end of pintle 62 for retaining the worm 58. The opposite end of the lever 63 has an outwardly extending flange 68 provided with a suitable aperture to slidably receive'a pin 69. A plate H3 is secured to one end of pin 69 in any suitable manner such as by means of a screw or a rivet head formed on a reduced portion H of the pin 69. A plate 13 is similarly secured to the other end of pin 69 which is similarly formed with a reduced end F4; The pin 69 is surrounded by a compression spring 15 which resiliently engages the opposed faces of the flange 68 and the plate to normally force the same apart and to pull the plate 13 into abutment with the flange '68. A wedge-like finger or detent I1 is formed on the inner edge of the plate '23 and fits between the inner edge of. the flange 58 and an abutment 19 formed as a part of the stop and extending across the inner end of the recess 64. The detent 11 serves to lock the lever 63 against movement and thereby prevents displacement of the worm 58 from the rack 60.-

The outer edge of the threads'of the worms 58 are preferably knurled to facilitate manipulation, and a micrometer adjustment of the stops 55 and 51 longitudinally of the shaft is effected by r0ta-,

tion of the worms in mesh with the rack 65. However, when it is desired to more radically adjust the position of the stops on the bar 55, pressure upon the plate I0 will compress the spring and force the pin 69 through the flange 68 to carry the plate l3away from the flange andthus remove the; detent; 1.1 out of, the recess 54, This willpermit the lever 63 to pivot on the pin 65, to carry the worm 58 out oiengagement with the rackBO (seev Fig. 5), whereupont'ne stop may be slidably adjusted to any desired position on the bar 55. Upon releasing pressure on the plate 10, the spring 15 will force the associated parts back to normal position-and cause the detent Tl again to enter into the recess ,64, whereby the worm 58 will again becarried into engagement with the rack 56. The stop may then be adjusted with micrometer exactness, to the precise position desired.

An intermediate: skip-stop 8!, having similar iunctionsas the skip-stop 28 hereinbefore de: scribed, 'ispreferably formedgas a, block 82 slid1 able longitudinally of the bar 55. The block 82 may be of rectangular shape and of transverse dimensions less than that of the-stops 55 andrlifl.

Aworm 83 is provided for engagement with the.

rackifl to eifect micrometer adjustment and: is operatively associated with yieldable means of-a similar character to that described in connection with the stop 51 for locking the skip-stop against accidental displacement. Thus, stop 8i may-be movedto any desired, position intermediate stops 56 and 51 and adjusted with micrometer precis sion.

A suitable skip lever 84 embraces the block-,8! and is pivotally mounted. thereon by means of .a pin 85. The lever 84 is similar in construction; andfunction to the lever 42 hereinbefore described and has a pawl 81 which serves to limit upward movement of a stroke arm 88 after the latter has been carried past the skip-stop 81. The bar 55 may be provided with means, similarlyas the bar H], for imparting relative movement about;

its axis to remove the pawl 81 from the path of the arm 88 so that the arm may complete a full stroke between the principal stops. The resilient locking means hereinbefore described, will prevent disengagement of the worms 58 and 82, and the stops will thus be maintained against acci-j dental movement due to concussion incident to contact with the arm 88.

From the foregoing it will appear that the; invention provides adjustable control means of an improved character for machines having reciprocable parts, and adjustment of the control may be effected with ease and precision even while the machine is in operation. The control is provided with stops which are mounted to effect micrometer adjustment, and which embody yieldable locking means serving to prevent accidental movement of the stops. In addition, by somewhat modifying the construction, the stops are adapted for substantial slidable relative adjustment as well as micrometer screw adjustment.

I claim as my invention:

1. In a control device for machine tools, in combination, a bar, a member encircling said bar. and movable longitudinally thereof, means for position of said member on said bar and including a threaded part on said member, cooperative with complementary means on said bar to receive the threads of said part where,- by movement of said member on the bar is effected by simple manipulation to adjust said threaded part relative to said complementary means; and locking means carried by said member for retaining said member in adjusted position on said bar and for preventing accidental movement of the member relative to the bar.

. 2. Ina controldevicefor a machine, havin a 75:

reciprocatory moving part, in combination, a bar, a member mounted on said bar and adjustable longitudinally thereof, said member being positioned adjacent a. reciprocable operating element of the machine movable adjacent said bar and intermittently contacting said member with relative force, means for accurately adjusting the position of said member on said bar and including a threaded part on said member in engagement with complementary means on said bar coacting with the threads thereof, and locking means embodying a movable locking element and yieldable compression means carried by said member for retaining the same in adjusted position on said bar in spite of concussion incident to forceful contact between said member and said element.

3. A skip-stop control device comprising in combination, a stop bar, a pair of principal stops in substantially spaced relationship on said bar, a skip-stop on said bar intermediate said principal stops, means for precision adjustment of said skip-stop relative to said principal stops and including a rotatable screw threaded member, complementary means on said bar engageable by the threads of said member, and means embodying a locking wedge carried by said skip-stop for holding said member in a given relation with respect to said bar and thereby retaining the same in adjusted position against accidental movement.

4. In a skip-stop control device for machine tools, a bar, a stop slidable on said bar including a movable element and a part encircling said bar and relatively movable between the ends of the bar, screw threaded means carried by said element, means on said bar and extending throughout a substantial portion of the length of the bar and engageable by said screw threaded means whereby adjustment of said stop on said bar is effected by relative screw action between said means, and yieldable locking means including a part normally disposed to prevent movement of said movable element.

5. A control stop mechanism for machine tools comprisinga bar, an internally threaded manually adjustable stop member on said bar, complementary means in the form of screw threads on said bar and adapted to be engaged by the threads of said stop, an engaging face on said bar, and yieldable means associated with said stop and engaging with said face to prevent accidental movement of the stop relative to the bar.

6. A control stop mechanism for machine tools comprising a bar, an internally threaded manually adjustable stop in engagement with said bar, complementary means in the form of threaded sections tapped in the periphery of said bar and in engagement with the threads of said stop, a longitudinal engaging face on said bar, a radial recess in said stop, and yieldable means in said recess and in engagement with said face to pre vent accidental movement of said stop relative to said bar.

'7. In a control stop device of the character described, in combination, a bar, a stop member embracing said bar and adapted for longitudinal movement thereon, said member including a block having an integral extension on one face provided with a segmental rim, an annular internally threaded member having an integral collar provided with an annular recess for slidably receiving said segmental rim, and complementary screw threads on said bar engaged by said annular member whereby rotation of said annular member will move said stop member.

8. In a control stop device for machine tools, a bar, a stop slidable on said bar, a lever member pivotally associated with said stop, a worm carried by said lever member, means on said bar engageable with said worm whereby rotation of said worm effects relative longitudinal movement of the stop relative to the bar, and a manually operable yieldable lock movable into and out of engagement with said lever for positively retaining said worm in engagement with said bar.

9. In a control device for machine tools, a bar, a stop slidable on said bar, a lever pivotally associated with said stop, a worm carried by said lever, means on said bar engageable with said worm whereby rotation of said worm efiects relative longitudinal movement of the stop on the bar, and a lock movable into and out of engagement with said lever including a compression spring for holding the lock in looking condition to normally maintain said worm in engagement with said bar.

10. In a device of the character described, a bar, a stop on said bar including a member movable into and out of engagement with said bar, means spring for resiliently forcing said detent into position, said detent being releasable incident to movement of said member out of engagement with said bar.

11. In a control device, a bar, a stop member slidable longitudinally of said bar, a lever pivotally mounted on part adapted to be normally wedged between the spaced end of said lever and said bar to prevent movement of the lever relative to the bar.

12. In acontrol device of the character deon said bar, and means for locking the same against and including a lock part movable into and out of engagement therewith and a spring normally urging said part into locking relationship with pivotal movement 13. In a control device, a bar, a stop member slidable longitudinally of said bar, said member having a slot formed therein, a lever pivotal in said slot, a worm rotatably attached to one end of said lever, complementary means in the nature of a rack formed on said bar and engageable by said worm to provide for micrometer adjustment of said stop on said bar, a flange on the opposite end of said lever, a pin slidable in an aperture formed in said flange, a pair of carried by said member plates attached to opposite ends of said pin, a compression spring between one of said plates and said flange, the flange end of said lever being spaced from the body of said stop, and a detent formed on one of said plates and engageable in the space between said end and body to lock said lever and prevent disengagement of said worm except when said detent is removed from locking position by compressing said spring to move said pin and attached plates out of locking position.

14. In a skip-stop control device for machine tools, a bar having a longitudinal engagement portion in its periphery, a stop encircling said bar and adapted for longitudinal movement thereon, screw-threaded means on said stop, means on said bar adapted for cooperative engagement with said screw-threaded means whereby to effect micrometer adjustment of said stop on said bar, and yieldable retaining means carried by said stop cooperative with said engagement portion to prevent unintentional movement of said stop relative to said bar.

15. In a skip-stop control device for machine tools, a bar having a plurality of longitudinal engagement portions and alternate laterally projecting portions in circumferentially spaced relation about its periphery, screw threads formed in said projecting portions, a rotary and longitudinally movable stop member encircling said bar and internally threaded to coact with the screw threads on said bar, and yieldable means carried by said stop member cooperative with said engagement portions for retaining said stop member against unintentional movement relative to said bar, the number and spacing of said engagement faces and the pitch of said screw threads being determinative of the degree of longitudinal movement possible upon rotation of said stop to carry said yieldable means from one engagement face to an immediately adjoining face.

16. In a skip-stop control mechanism for machine tools, in combination, a cylindrical bar having a rack formed longitudinally thereof, a member encircling said bar and longitudinally and rotatably slidable thereon, movable means carried by said bar and including a threaded element engageable with said rack, said threaded element being rotatable to adjust the member by slight degrees longitudinally of the bar, and means for locking said movable means to prevent displacement of said threaded element from said rack, whereby said member will be retained against unintentional rotary and longitudinal movement relative to said bar.

1'7. In a control device for a machine tool having a reciprocating moving part, in combination, a stop bar, a pair of principal stop members mounted in spaced relation on said bar, said stop members being disposed on opposite sides of an operating element carried by the reciprocable part of the machine and alternately engageable thereby to define the utmost limits of reciprocation of said part, one of said stop members having a threaded connection with the bar whereby precision adjustment of the relative spacing of the members may be effected, a skip-stop member mounted on said bar intermediate said principal stop members and engageable by said operating element to confine the reciprocation of said part of the machine within more restricted limits, said skip-stop member having a threaded connection with the bar whereby precision adjustment of the member relative to the principal stop members may be effected, and means for retaining said one principal stop member and said skip-stop member in adjusted position on said bar against accidental movement relative to the bar.

ALBERT M. JOHNSON.

Cir 

